building features, fixing infrastructure, and shipping AI-powered learning tools.

Toptutors is a Danish tutoring marketplace expanding into AI tutors and learning tools. When I joined, they had an early AI chat live but a lot of foundational issues - buggy cron jobs, unreliable notification systems, and infrastructure that needed hardening as the platform scaled.

Built the documents system using Tiptap with AI chat integration

Implemented slash commands and toolbar AI commands (Notion-style UX)

Created learning journeys feature

Improved the chat system and added AI capabilities

Architected event-driven backend supporting 10k concurrent connections

Reduced backend latency 20% through PostgreSQL optimization and Redis caching

Set up observability on endpoints I implemented using Sentry, catching 35% of issues before users saw them

Fixed Stripe payment flows, reducing payment-related bugs by 23%

Built internal CLI tools that cut debugging time from hours to minutes

Fixed bugs daily, shipped PRs constantly